这本书是老外写的书，焦海波翻译的，还不错。LWIP的主要目的是减少存储器利用量和代码尺寸，使 LWIP适合应用于小的、资源有限的处理器如嵌入式系统。为了减少处理器和存储器要求，lwIP可以通过不需任何数据拷贝的API进行裁减。-This book is a book written by a foreigner, Jiao Haibo translation, not bad. LWIP main purpose is to reduce memory utilization and code size, so LWIP suitable for small, limited processor resources, such as embedded systems. In order to reduce the processor and memory requirements, lwIP can copy data without any API for cuts.